Boiler.



'm. 69l ,7l 2. I I Pafented Jan. 21, I902.

- e. E. BLAKE & c. MLBELL.

BOILER.

(Application filed Feb. 11, 1901.)

(No Model.)

Wiigcsses No. 69l,7l2 I Patented Ian. 2|, I902. G. E. BLAKE &. C. M. BELL.

B0 l L E B.

(Applicstion filed Feb. 11, 1901.)

2 Sheets-Sheet 2.

(No Model.)

M; e g

wiigesses 40 the under side of the inner shell.

lars or flanges, of which the first two men-- UNITED STATES PATENT OFFICE.

GEORGE EDWARD BLAKE AND CARROLL MELVIN BELL, OF GREENOASTLE, INDIANA, ASSIGNORS TO GREENCASTLE AUTOMOBILE COMPANY, OF

GREENOASTLE, INDIANA.

BOILER.

$PEOIFIGATION forming part of Letters Patent No. 691 ,712, dated January 21, 1902.

Application filed February 11, 1901. Serial No. 46,912. (No model.)

To all whom it may concern:

Be it known that we, GEORGE EDWARD BLAKE and CARROLL MELVIN BELL, citizens of the United States, residing at Greencastle,

in the county of Putnam and State of Indiana, have invented a new and useful Boiler, of which the following is a specification.

This invention relates to boilers, and more particularly to the class of water-tn be boilers; [0 and it has for its object to provide a boiler particularly designed for use with gas as a fuel and in which there will be an efficient circulation and heating.

A further object of the invention is to provide a boiler from which the tubes and tubesheets may be easily removed to be repaired or replaced, which will require a minimum of stays, and which will be simple and cheap of' manufacture.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure l is a longitudinal vertical section through the boiler. Fig. 2 is a section on line 2 2 of Fig. 1. Fig. 3 is an elevation showing the right-hand end of the boiler with the boiler-head removed. Fig. 4 is an elevation showing the left-hand end of the boiler with the head removed.

Referring now to the drawings, the boiler comprises an outer cylindrical shell 5, within which is disposed a second shell 6, which is cylindrical, excepting for its upper side 7, which is flat, as shown, and forms the crown- 5 sheet for the boiler. The two shells are concentric and are held in such relation by staybolts 8 and also by the cylindrical flanges or collars at the ends of the crown-sheet 7 and the similar flange or collar 11 at the center of These coltioned are shown at 9 and 10, connect openin gs formed in the inner and outer shells and which aline. The inner shell is substantially 5 the same length as the outer shell, and at one end thereof is formed an inwardly-directed flange 13, while at the opposite end is the outwardly-directed flange 14. A tube-sheet 15 is bolted against the inner side of the flange 5o 13, and when disengaged therefrom may be drawn through and out at the opposite end of the shell.

Against the outer face of the flange 14 is bolted a second tube-sheet 16, and connecting these two sheets,which are suitably'drilled or punched, are water-tubes 17, the ends of which are rolled down against the outer faces of the sheets in the usual manner, the tubes and sheets thus forming, in effect, an integral part of the structure, so that they may be bodily moved into or out of the inner shell for repair'or for replacing in whole or in part.

The bottom row of water-tubes is spaced some distance from the bottom of the inner shell, and between this bottom row of tubes and the bottom of the shell is disposed a perforated-burner-plate 20, through which the gas is delivered to the furnace formed by the inner shell.

The gas is introduced through the collar 11 and in striking the burner-plateflows over the under side thereof and passes through it and to the upper surface thereof, where it is burned, the flames passing between the tubes and finally out through the collars 9 and 10.

The outer shell 5 is provided with outwardly-directed flanges 21 and 22 at its ends, and against which flanges are bolted the boiler-heads 23 and 24, which are convex, as shown, to permit of the formation of waterchambers between them and the ends of the boiler-tubes. With this construction it will be seen that there isprovided a water-cham ber completely inclosing the inner shell and that there will be a circulation of water through the tubes, whereby quick and eflicient steaming will be effected. Furthermore, with the present construction few staybolts are required, and the entire boiler may readily set up and taken down, While the first cost, as also the cost of repairs, is small.

It will be understood that in practice modifications of the specific construction shown may be made and that any suitable materials and proportions may be used for the various parts. Furthermore, it will be noted that theinwardly-directed flange at one end of the inner shell is of such shape as to permit of the omission of a segmental portion from the lower edge of the adjacent flue-sheet I00 to permit of the shell being moved over the burner-plate.

What is claimed is- 1. In a boiler the combination of an inner shell and an outer shell completely inclosing the inner shell to form an intervening waterchamber extending around and across the ends of the inner shell, said shells having alined openings, collars connecting the openings to permit the passage of heat through the water-chamber to and from the inner shell, and a burner-plate within the inner shell between the lower side thereof and one of said openings.

2. A boiler comprising an inner shell and an outer shell and a burner-plate within the inner shell, said shells having a flue passed therethrough to supply fuel to the burnerplate and an additional flue therethrough to convey products of combustion from the inner shell.

3. A boiler comprising an inner shell having water-tubes passsd therethrough, and an outer shell inclosing the inner shell and with which the tubes communicate, a burner-plate within the inner shell and disposed to supply heat to the tubes, and fiues passed into and out of the inner shell through the outer shell for conveying fuel to the burner-plate and for carrying 01% products of combustion.

4. In a boiler, the combination of an outer shell and an inner shell separated by a con tinuous water-chamber, tubes connecting the ends of the inner shell and communicating with the Water-chamber, a perforated burnerplate within the lower portion of the inner shell and below the tubes, 2. flue leading to the inner shell below the burner-plate, and flues leading from the inner shell above the tubes.

5. A boiler including a shell having an inwardly-directed flange at one end and an outwardly-directed flange at the opposite end, a flue-sheet disposed against the inner face of the inner flange, a flue-sheet disposed against the outer face of the outer flange, tubes connecting the sheets, and means for holding the sheets against the flanges.

6. A boiler comprising a shell having water-tubes disposed therein, and provided With fines leading to the exterior of the tubes, and a perforated burner-plate disposed between the tubes and a flue at the bottom thereof.

In testimony that we claim the foregoing as our own we have hereto aifixed our signatures in the presence of two witnesses.

GEORGE EDWARD BLAKE. CARROLL MELVIN BELL.

lVitnesses:

MYRTLE BRooKs, W. G. OVERSTREET. 

